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Black Diamond Gizmo

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Robert Carver BPL Member
PostedJan 21, 2012 at 4:45 pm

I lost my original Gizmo a few months ago. Never had any problems with it. I purchased another one as a replacement. Was using the new one in camp on a trip. Had fresh batteries in the unit.
While sitting around camp with the light set to the dimmest setting, the light turned off. I went to turn it back on and it would flash, but wouldn't turn back on.
After a few minutes, I tried the unit again. It would turn on but only for five or six minutes.
I contacted Black Diamond regarding what the headlamp was doing. They confirmed that the unit should not be turning itself off. I was asked to send that unit to them so they could examine it.
I purchased another one while they had the unit in question. Thinking it was a faulty headlamp.
Just last night while on an overnight trip to the Smokies, the headlamp I just purchased starting doing the same thing.
Any headlamp I have used previously would always dim until no longer have usable light. Not just turn off. Seems very weird to me.
Has anyone else had a similar experience like this with a Gizmo or another headlamp?

Bob Gross BPL Member
PostedJan 21, 2012 at 5:02 pm

Lots of modern LED headlamps have a very fancy LED driver circuit. Normally, as long as the battery is normal, it takes the battery power, "chops" it to regulate intensity, and then sends that to the LED head. When the battery droops and its voltage is too low, the driver circuit is forced to keep cranking things up to try to maintain the light intensity. At a certain point (called Low Voltage Disconnect), it thinks that the battery is finished, and it simply halts. Otherwise, the driver circuit will burn up.

Now, either the LED driver circuit is faulty, or else the battery is almost dead, or else the battery is the wrong type for that device.

I saw one guy who had a problem like this with one headlamp and one battery, so he took it back to the store. They gave him a replacement, so he put the original battery into the replacement, and he got the same poor results. It was user error for using a crappy battery without testing it.

–B.G.–

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